Tektronix 2230 Service Manual

Adjustment Procedure—2230 Service
Table 5-2
Power Supply Limits
Power
Test
Reading
Supply
Point
(Volts)
-8.6 V
W961
-8.56 to -8.64
-5.0 V W9020
-4.75 to -5.25
+5.0 V W9068
+4.75 to +5.25
+ 8.6 V W960
+ 8.43 to +8.77
+30 V W956
+29.1 to +30.9
+ 100 V
W954
+97.0 to +103.0
d. ADJUST—Grid Bias (R851) for a visible dot. Then
back off the Grid Bias potentiometer until the dot just
disappears.
e. Disconnect the 50 0 termination from the EXT
Z AXIS INPUT connector.
3. Adjust Astigmatism (R874)
a. Set:
A INTENSITY Visible display
X-Y Off (button out)
Channel 1 AC-GND-DC DC
A SEC/DIV 5 ^
b. Connect the leveled sine-wave generator output via
a 50 Q cable and a 50 D termination to the CH 1 OR X
input connector.
c. Set the generator to produce a 50 kHz, 4-division
display.
d. ADJUST—Astig (R874) and the front-panel FOCUS
control for the best defined waveform.
e. Disconnect the test equipment from the instrument.
4. Adjust Trace Alignment
a. Position the trace to the center horizontal graticule
line.
b. ADJUST—The front-panel TRACE ROTATION con
trol for optimum alignment of the trace with the center hor
izontal graticule line.
5. Adjust Geometry (R870)
a. Set:
CH 1 VOLTS/DIV 50 mV
A SEC/DIV 0.1 ms
b. Connect 50 ns time markers from the time-mark
generator via a 50 Q cable and a 50 ft termination to the
CH 1 OR X input connector.
c. Adjust the Channel 1 POSITION control to position
the baseline part of the display below the bottom horizon
tal graticule line.
d. Adjust the SEC/DIV Variable control for 5 markers
per division.
e. ADJUST—Geom (R870) for minimum curvature of
the time markers at the left and right edges of the
graticule.
f. Set the Channel 1 AC-GND-DC switch to GND.
g. ADJUST—Geom (R870) for minimum curvature of
the baseline trace when positioned at the top and bottom
horizontal graticule lines using the Channel 1 POSITION
control.
h. Set the Channel 1 AC-GND-DC switch to DC.
i. Repeat parts e through h for optimum compromise
between the vertical and horizontal displays.
j. Disconnect the test equipment from the instrument.
5-5

Tektronix 2230 Specifications

General

Brand	Tektronix
Model	2230
Category	Test Equipment
Language	English